https://padlet.com/lukeygeorge/y0pkkkoevi6s en-us 2016-09-29 13:54:10 UTC 2016-10-03 09:53:09 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Terminator.png lukeygeorge https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127256588 Its a device that led to the discovery of photography  and the photographic camera. It consists of a box or a dark room with a small hole on one side to allow light into it. Light from an external scene passes through the hole and strikes a surface inside, where it is reproduced, rotated 180 degrees. The image can be projected onto paper, and can then be traced to produce a highly accurate representation. The largest camera obscura in the world is on Constitution Hill in Aberystwyth, Wales. ]]> 2016-09-29 13:59:10 UTC https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127256588 lukeygeorge https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127261351 Daguerre was born in Cormeilles-en-Parisis, Val-d'Oise, France. He was apprenticed in architecture, theatre design, and panoramic painting to Pierre Prévost, the first French panorama painter. Exceedingly adept at his skill of theatrical illusion, he became a celebrated designer for the theatre, and later came to invent the diorama, which opened in Paris in July 1822.]]> 2016-09-29 14:09:50 UTC https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127261351 lukeygeorge https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127263613 In 1829, Daguerre partnered with Nicéphore Niépce, an inventor who had produced the world's first heliograph in 1822 and the first permanent camera photograph four years later. Niépce died suddenly in 1833, but Daguerre continued experimenting, and evolved the process which would subsequently be known as the daguerreotype. After efforts to interest private investors proved fruitless, Daguerre went public with his invention in 1839. ]]> 2016-09-29 14:14:46 UTC https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127263613 lukeygeorge https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127502330 Daguerreotypes were usually portraits; the rarer landscape views and other unusual subjects are now much sought-after by collectors and sell for much higher prices than ordinary portraits. Samuel Morse was astonished to learn that daguerreotypes of the streets of Paris did not show any people, horses or vehicles, until he realized that due to the long exposure times all moving objects became invisible. Within a few years, exposures had been reduced to as little as a few seconds by the use of additional sensitizing chemicals and "faster" lenses such as Petzval's portrait lens, the first mathematically calculated lens.]]> 2016-09-30 12:43:15 UTC https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127502330 lukeygeorge https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127505033 Born 11 February 1800 and died 17 September 1877, he was a British scientist, inventor and photographer pioneer, he invented salted paper and calotype processes His work in the 1840s on photomechanical reproduction led to the creation of the photo-glyphic engraving process, the precursor to photogravure. He was the holder of a controversial patent which affected the early development of commercial photography in Britain. He was also a noted photographer who contributed to the development of photography as an artistic medium. ]]> 2016-09-30 12:53:05 UTC https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127505033 lukeygeorge https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127720267 2016-10-02 12:40:59 UTC https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127720267 lukeygeorge https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127720317 Both inventors had no idea about each other. Daguerre's developmental work in the mid-1830s coincided with photographic experiments being conducted by Henry Fox Talbot in England. Talbot had succeeded in producing a "sensitive paper" impregnated with silver chloride and capturing small camera images on it in the summer of 1835, though he did not publicly reveal this until January 1839.  Talbot didn't know that Daguerre's partner Niépce had obtained similar small camera images on a silver chloride coated paper almost 20 years earlier. Niépce could find no way to keep them from darkening all over when exposed to light for viewing and had therefore turned away from silver salts to experiment with other substances such as bitumen. Talbot chemically stabilized his images to withstand subsequent inspection in daylight by treating them with a strong solution of common salt.]]> 2016-10-02 12:41:59 UTC https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127720317 lukeygeorge https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127721011 The history of photography has roots in remote antiquity with the discovery of the principle of the camera obscura and the observation that some substances are visibly altered by exposure to light. As far as is known, nobody thought of bringing these two phenomena together to capture camera images in permanent form until around 1800, when Thomas Wedgwood made the first reliably documented although unsuccessful attempt. In the mid-1820s, Nicéphore Niépce succeeded, but several days of exposure in the camera were required and the earliest results were very bad. Niépce's partner Louis Daguerre went on to develop the daguerreotype process, the first publicly announced photographic process, which required only minutes of exposure in the camera and produced clear, finely detailed results. It was commercially introduced in 1839, a date generally accepted as the birth year of practical photography. The metal-based daguerreotype process soon had some competition from the paper-based calotype negative and salt print processes invented by Henry Fox Talbot. Subsequent innovations reduced the required camera exposure time from minutes to seconds and eventually to a small fraction of a second. The camera was also able to take pictures in a natural colour as well as in black and white. The commercially introduced computer based digital cameras in the 1990s revolutionised photography. During the first decade of the 21st century, traditional film-based photochemical methods were increasingly marginalised as the practical advantages of the new technology became widely appreciated and the image quality of moderately priced digital cameras was continually improved.]]> 2016-10-02 12:57:56 UTC https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127721011 lukeygeorge https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127814640 2016-10-03 09:33:34 UTC https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127814640 lukeygeorge https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127814862 2016-10-03 09:34:56 UTC https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127814862 lukeygeorge https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127815223 2016-10-03 09:37:18 UTC https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127815223 lukeygeorge https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127815511 2016-10-03 09:39:25 UTC https://padlet.com/lukeygeorge/y0pkkkoevi6s/wish/127815511